How to Answer "How do you do it?"

I get this question a lot. If you have a big family, you know what I'm talking about.

There are lots of questions, actually. Everything from "How do you do it, seriously? I had 2 and went crazy!" to "Why? Really, why?"

People sometimes ask me when they see my toddler and me alone together if she's my first. Or sometimes when I've been pregnant, they just start talking to me about what to expect about parenthood, and it quickly becomes obvious that they've assumed this is my first. ("It changes EVERYTHING!" they gush.)

One friend's mom (who had 6 kids, as I recall) told me that someone had once asked her whether she was crazy or stupid. I think she claimed stupid. It's funny the way she tells it.

But that's not the answer I'm looking for.

Do I claim to be such a good mom that I just can't say 'no' to a child who would otherwise be condemned to a life with some less-worthy parent? Or joke that I am still figuring out how to be a good mom, and this is just Rough Draft #7?